A tetris platformaer? First time I've seen that. What a cool concept. I agree with the comment that it could have been nice to be eased into all of the different tiles. But it was easy enough to understand what was good and what was dangerous from the sprites alone.

Very fun game! I enjoyed it! An improved Tetris! I don't know if it was just my screen, but It was a very tiny screen! It would be much better to play it on full screen. Having that in mind, the letters were too small and had no contrast! Improving that could enhance playability and the readability of the controls menu. Also, I'd include a tiny hint with the controls and type of tiles, but it's just a matter of opinion.

The concept is SUPER COOL.
But IMO all different blocks + the dual gameplay can be a little intimidating/overwhelming. 

It might be interesting to start with simple blocks and add more and more different blocks as you progress through the game.

Well done !